Question about 2004 GMC Envoy
Check you air flow position sensor should be behind radio that an electronic unit vacuum line wont solve
Posted on Jul 01, 2009
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Posted on Jan 02, 2017
The blend door(s) actuator is more than likely the problem, this is a common issue with this vehicle. The repair is complex, it involves gaining access to the HVAC housing in the dash. Visit www.trailvoy.com and search on HVAC.
Posted on Sep 09, 2010
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